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參數資料
| 型號： | EVAL-AD5233SDZ |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 18/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR AD5233 |
| 標準包裝： | 1 |
| 系列： | * |
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AD5233
Rev. B | Page 25 of 32
PROGRAMMABLE STATE-VARIABLE FILTER
One of the standard circuits used to generate a low-pass, high-
pass, or band-pass filter is the state-variable active filter. The
AD5233 digital potentiometer allows full programmability
of the frequency, the gain, and the Q of the filter outputs.
Figure 52 shows a filter circuit using a 2.5 V virtual ground,
which allows a ±2.5 V peak input and output swing. RDAC2
and RDAC3 set the low-pass, high-pass, and band-pass cutoff
and center frequencies, respectively. RDAC2 and RDAC3
should be programmed with the same data (as with ganged
potentiometers) to maintain the best Circuit Q.
A3
A2
A1
0.01F
RDAC3
LOW-PASS
BAND-PASS
HIGH-PASS
RDAC2
B
RDAC4
B
VIN
B
RDAC1
2.5V
OP279 × 2
R2
10k
R1
10k
A3
B
0
2
794
-0
53
Figure 52. Programmable Stable-Variable Filter
The transfer function of the band-pass filter is
2
O
i
BP
S
Q
S
Q
A
V
ω
+
ω
+
ω
=
(9)
where AO is the gain.
For RWB2(D2) = RWB3(D3), R1 = R2, and C1 = C2:
C1
R
WB2
O
1
=
ω
(10)
WA1
WB1
O
R
A =
(11)
R1
R
Q
WB1
WB4
WA4
×
=
(12)
Figure 53 shows the measured filter response at the band-pass
output as a function of the RDAC2 and RDAC3 settings, which
produce a range of center frequencies from 2 kHz to 20 kHz.
The filter gain response at the band-pass output is shown in
Figure 54. At a center frequency of 2 kHz, the gain is adjusted
over the 20 dB to +20 dB range, determined by RDAC1.
Circuit Q is adjusted by RDAC4 and RDAC1. Suitable op amps
for this application are OP4177, AD8604, OP279, and AD824.
40
20
100
1k
10k
100k 200k
FREQUENCY (Hz)
AM
P
L
IT
UDE
(
d
B)
0
–20
–40
–60
–80
20
20k
–16
*
02
79
4-
0
54
Figure 53. Programmed Center Frequency Band-Pass Response
40
20
100
1k
10k
100k 200k
FREQUENCY (Hz)
AM
P
L
IT
UDE
(
d
B)
0
–20
–40
–60
–80
20
2.0k
–19.01
02
79
4-
0
55
Figure 54. Programmed Amplitude Band-Pass Response
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